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Greenhouse gases in the Earth’s atmosphere reached another grim milestone earlier this year as carbon dioxide levels surpassed the symbolic threshold of 400 parts per million across much of the planet, the premier global meteorologi...

Some milestones, like obtaining a driver's license or getting called hipster trash in Internet blog comments, are worthy of celebration. Others, like the Earth's carbon dioxide levels reaching their highest monthly average concentra...

It's all but official now: 400 ppm is the new normal.
“Is it possible that October 2016 will yield a lower monthly value than September and dip below 400 ppm? Almost impossible,” Ralph Keeling, the scientist who runs the Scripps Ins...

The world has hit a global warming milestone it may never recover from.
Scientists at the Mauna Loa Observatory in Hawaii announced in 2013 that atmospheric concentrations of carbon dioxide reached a daily average above 400 parts pe...

Climate Central: The World Passes 400 PPM Threshold. Permanently
In the centuries to come, history books will likely look back on September 2016 as a major milestone for the world’s climate. At a time when atmospheric carbon dioxide...